Brake-shoe.



No. 721.526. 4 'PATENTED FEB. 24 1903..

0. M. STIMSON & P. PARKE.

BRAKE SHOE. APPLIOATION FILED 110?.14, 1902.

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' 0. M. STIMSON' & P. PARKE. I

BRAKE SHOE. APPLICATION FILED NOV. 14, 1902.

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UNITE STATES PATENT OFFICE.

- OSCAR M. STIMSON AND PETER PARKE, OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 721,526, dated February24, 1903. Application filed November 14,1902. Serial No- 13l,406. (Nomodel.)

Be it known that we, OSCAR M. STIMSON and PETER PARKE, citizens of theUnited States, residing at Chicago, in the county of Cook and State ofIllinois, have invented new and useful Improvements in Brake Shoes, ofwhich the following is a specification.

This invention relates to certain new and useful improvements in brakeshoes, and more particularly to that type of brake-shoes in which theshoe is formed of two or more metals and the back thereof strengthenedto preserve the integrity of the shoe until worn out.

The invention has for its object to provide a brake-shoe with ahard-metal insert exposed on the wearing-surface of the shoe to theaction of the wheel, said insert being incorporated in and surrounded bya soft metal composing the body of the shoe, thus presenting aconstantly-varying composite wearing-surface uniformly distributed overthe operative face of the shoe.

It also has for its object to strengthen the construct a brake-shoewhich will be ex-' tremely simple and inexpensive in construction,strong, durable, and efficient in use, and whichwill furnish anelfectivebraking power until the braking-surface is entirely worn away.

To these ends the invention consists in the features and in. theconstruction, combination, and arrangement of parts, as hereinafterdescribed, and particularly pointed out in the claims, reference beingbad to the accompanying drawings, forming a part of this specification,wherein v Figure 1 is a front elevation of the brakeshoe. Fig. 2 is aside View thereof, showing in dotted lines the ductile metal forstrength- ,of the complete brake-shoe. view of the ductile-metal screenfor strengthmetal strengthener. Fig. 5 is a similar view I takentransversely through the center of the shoe. Fig. 6 is a longitudinalsectional view Fig. 7 is a plan ening the back of the shoe. Fig. 8 is asimilar view of the hard-metal insert. Fig. 9 is a View similar to Fig.6, showing the ductilernetal screen cast in the back of the metalinsert; and Fig. 10 is a transverse sectional View taken on the line 1010 of Fig. 9.

Our improved brake-shoe comprises three separately-constructedpartsviz., the body portion of the shoe constructed of relatively softmetal, the hard-metal insert, and the reticulated strengthener formed ofductile metal. r

As shown in the drawings, the body of the brake-shoe is segmental inshape and comprises a curved back 1, longitudinal sides 2, and ends 3,the outer edges of the sides and ends of the shoe conforming in contourto the general shape of the back 1 and forming a recess in the front orinner face of the shoe for the reception of the insert.

As shown in Fig. 2 3 of the drawings, the insert comprises a pluralityof substantially V- shaped ribs 4, a center stud 5, and end studs 6. Theribs 4 are formed, preferably, in two series, said series being arrangedon either side of the center stud 5, the ribs in each series beingdisposed parallel to each other and the apices of the ribs comprisingthe two series being disposed in opposite directions, the ribs being sodisposedfthat the apices of both sections will project toward the endsof the insert. Each of the ribs is of the shape of a truncated cone incross-section that is to say, the opposite sides of each rib convergetoward each other from their rear toward their front sides. The centerstud 5 is preferably square in cross-section and has the cross-sectionalshape of the form of a frustum of a pyramid that is to say, its foursides are inclined from the back toward the front of the studthe sidesof the stud being preferably arranged parallel to the adjacent sides ofthe two innermost ribs of the two series. The end studs 6 are preferablytriangular-shaped in cross-section and are arranged at the four cornersof the insert, the inner sides of the said studs being arranged parallelto the adjacent sides of the outermost ribs of the series, and the innersides of said studs are formed at an inclination, the base of each ofthe studs being the widest portion thereof. The ribs and studscomprising the insert are cast at a single operation in the mannerhereinafter explained, and in casting the insert suitable provision ismade in the mold for casting gates 7, which unite the several ribs andstuds and hold them in their proper relative positions.

As shown in Fig. '7 of the drawings, the metallic strengthener consistsof a reticulated sheet or plate of approximately the same dimensions asthe insert and is formed of a plurality of steel wires 8 and 9, thelongitudinal wires 8 forming the warp of the woven-wire fabric and thetransverse wires 9 forming the woof thereof. Owing to the greater lengthof the warp-wires, and consequently owing to the fact that they aresubjected to a greater strain, said warp-wires are preferably made ofgreater diameter than the woof-wires 9. The warp and woof wires arewoven together in the manner of plain weaving, and said wires beingformed of ductile metal this operation may be readily and economicallyeffected on an ordinary wire-weaving machine.

The body of the shoe may be cast from any relatively soft metal and theinsert of any suitable hard metal, the screen or reticulatedstrengthener being preferably formed of ductile-steel wires.

'In constructing our improved shoe a mold is prepared to cast thehard-metal insert and the connecting-gates, and the hard metal is thenpoured into the mold, making an integral body of hard metal comprisingthe V- shaped ribs 4: and studs 5 and 6, said ribs and studs beingunited and held in their relative positions by the gates 7. A mold isthen prepared for the body of the shoe, and into this mold is placed thehardmetal insert, and on top of the latter is placed the metallicscreen. the mold to form the body portion of the shoe, comprising theback 1, sides 2, and ends 3. The soft metal flows about and entirelysurrounds the reticulated strengthener and flows between the severalribs 4 and between the studs 5 and 6 and the adjacent ribs, the resultbeing that the reticulated strengthener of ductile metal is incorporatedin the back of the shoe near the insert, and the insert is incorporatedwith the soft-metal face, sides, and ends of the body portion of theshoe.

In Figs. 9 and we show a slightly-modified form of shoe wherein thereticulated strengthener instead of being incorporated in the bodyportion of the shoe is incorporated in the back of the insert; but inall other re- The soft metal is then poured into spects the shoe thusconstructed conforms to the preferred construction hereinbeforedescribed. In constructing the shoe shown in said Figs. 9 and 10 a moldis constructed for the insert, in which is placed the metallic screen,and the hard metal is then poured into the mold, whereby the screen isincorporated in the back or rear portion of the insert. A mold is thenprepared for the body portion of the shoe, and the insert, having thereticulated strengthener incorporated in its rear portion, is placedwithin the mold, after which the soft metal is poured into the mold andflows about the insert and between the ribs and studs of the latter,thus completing the shoe in the manner described.

In constructing our improved shoe in the manner described we form ahomogeneous body, comprising a soft-metal body and a hard-metal insert,wherebyis provided a com posite braking-surface, which affords superioradvantages for distributing the disinte grated parts of the soft body ofthe shoe incident to wear over the wearing-surface of the hard metal,thus giving to the shoe the most effective braking qualities and at thesame time affording a maximum hardmetal surface possessing superiorwearing qualities. The soft-metal portion of the shoe, which is includedbetween the ribs and between the ribs and the studs, thoroughly bindsthe studs and ends of the body portion of the shoe together, and bymaking said ribs and studs tapered or approximately wedge-shaped incross-section, as before described, said hard portions constituting theinsert will be effectively held in place within the body portion of theshoe, and should any of the ribs or other portion of the insert becomefractured it will be impossible for the fractured portions of the insertto become separated or to drop or to be forced out of place. The screenformed of ductile metal and incorporated in therear portion of the shoeadds great strength to the latter and permits the shoe to be entirelyworn out, with little or no liability of the operative face of the shoebeing broken or fractured. It will be evident that by employing themetal screen in connection with the hard-metal insert havingwedge-shaped ribs it will be permissible to use adeeper insertwithout'weak ening the shoe and will permit the utmost wear before itbecomes necessary to discard the shoe on account of its being worn out.

Having described our invention, What we claim isl. A brake-shoecomprising a hard-metal insert provided with V-shaped independent ribsformed of two parts extending in opposite directions.

2. A brake-shoe comprising an insert provided with V-shaped ribs, acenter stud, and two pairs of end studs.

3. A brake-shoe comprising a hard-metal insert provided with V-sh apedribs, a center stud, and two pairs of end studs.

4. A brake-shoe comprising an insert provided with ribs extending inopposite directions, a center stud, and-two pairs of end studs.

5. A brake-shoe comprising a hard-metal insert provided with V-shapedribs extending in opposite directions, a center stud, and two insertprovided with V-shaped ribs substantially wedge-shaped in cross-section.

8. A brake-shoe comprising an insert provided with V-shaped ribsextendingin opposite directions, and substantially wedgeshaped incross-section.

9. A brake-shoe comprising a hard-metal insert provided with V-shapedribs extending in opposite directions, and substantially wedge-shaped incross-section.

10. A brake-shoe comprising an insert provided with V-shapedribs,substantially wedgeshaped in cross-section, said insert beingprovided with a center stud tapering outwardly, and two pairs of endstuds each having one side thereof inclined.

11. A brake-shoe comprising a hard-metal insert provided with V-shapedribs substantially wedge-shaped in cross-section, said insert beingprovided with a center stud tapering outwardly, and two pairs ofendstuds each having one side thereofinclined.

12. A brake-shoe comprising an insert provided with V-shaped ribsextending in opposite directionsand wedge-shaped in cross-section, saidinsert being provided with a center stud and two pairs of end studs, thesides of said center stud tapering outwardly, and one side of each ofsaid studs being inclined outwardly.

13. A brake-shoe comprising an insert provided with ribs formed of twoparts, each of which is substantially wedge-shaped in crosssection, saidparts extending in opposite directions to one another.

14.. A brake-shoe comprising a hard-metal insert provided with ribsformed of two parts, each of which is substantially wedge-shaped incross-section, said parts being thicker at their inner ends thantheirouter ends.

15. A brake-shoe comprising an insert provided with V-shaped ribssubstantially wedgeshaped in cross section, and a metallic strengtheningscreen incorporated in the shoe.

16. A brake-shoe comprising a hard-metal insert provided with V-shapedribs substantially Wedge-shaped in cross-section, and a ductile metallicstrengthening-screen incorporated in said shoe.

17. A brake-shoe comprising an insert provided with V-shaped ribsextending in opposite directions to one another and substantiallywedge-shaped in cross-section, and a metallic strengthening-screenincorporated in said shoe.

18. A brake-shoe comprising a hard-metal i insert provided with V-shapedribs extending in opposite directions to one another and substantiallyWedge-shaped in cross-section, and a ductile metallicstrengthening-screen incorporated in said shoe.

19. A brake-shoe comprising an insert provided with V-shaped ribssubstantially wedgeshaped in cross-section, and a series oflongitudinally and transversely extending wires incorporated in saidshoe.

20. A brake-shoe comprising a'hard-metal insert provided with V-shapedribs substantially wedge-shaped in cross-section, and longitudinally andtransversely extending wires of ductile metal incorporated in said shoe.

21. A brake-shoe comprising a hard-metal insert provided with V-shapedribs substantially Wedge-shaped in cross-section, and a soft-metal bodysurrounding the insert and provided with connecting-ribs extendingbetween the ribs of the insert.

22. A brake-shoe comprisinga hard-metal insert provided with V-shapedribs substantially Wedge-shaped in cross-section, a soft-' metal bodysurrounding the insert and provided with connecting-ribs extendingbetween the ribs of the insert, and a metallic screen for strengtheningthe brake-shoe.

23. A brake-shoe consisting of a soft-metal body, a hard-metal insertincorporated in said body and provided with V -shaped ribs formed of twoparts, each of which extends in opposite directions to one another, anda metallic screen incorporated in the soft-metal body of the shoe.

24. A brake-shoe comprising a hard-metal insert provided with V-shapedribs substantially wedge-shaped in cross-section, a softmetal bodysurrounding theinsert, and means for strengthening the back of the bodyand insert. I

25. -A brake-shoe comprising a soft-metal body, a hard-metal insertincorporated in said body and provided with V-shaped ribs extending inopposite directions to one another and substantially wedge-shaped incross-section, and means for strengthening the back of the ,body and theinsert.

/ 26. A brake-shoe consisting of a body comprising a hard-metal insertprovided with ribs substantially wedge-shaped in cross-section, a centerand end studs, a soft-metal bodyinclosing said insert and studs, and ametallic strengthening-screen.

27. A brake-shoe consisting of a body comprising a hard-metal insertprovided with ribs.

substantially wedge-shaped in cross-section, a center and end studs, asoft-metal body inclosing the said insert and studs, and a ductile-metalstrengthening-screen embedded in.

said soft-metal body.

28. A brake-shoe comprising a wire screen for strengthening the backthereof, the diameter of the longitudinal wires of said screen beinggreater than the transverse wires thereof.

29. A brake-shoe comprising a hard-metal insert provided with V-shapedribs substantially Wedge-shaped in cross-section, a softmetal bodysurrounding the said insert, and a series of longitudinally andtransversely extending Wires incorporated in the said body forstrengthening the same, said longitudinal Wires being of greaterdiameter than the said transverse Wires.

30. A brake-shoe comprising a soft-metal body, a hard-metal insertincorporated in said body and provided with ribs extending in oppositedirections to one another, and a plurality of longitudinally andtransversely extending Wires incorporated in the soft-metal body forstrengthening the back thereof, said longitudinal wires being of greaterdiameter than the transverse Wires.

In testimony whereof We have hereunto set our hands in presence of twosubscribing Witnesses.

OSCAR M. STIMSON.

PETER PARKE. Witnesses:

W. 0. 000K, W. J. GALVIN.

